I can't seem to find similar issues on the internet to figure this out myself so I'm asking this forum. I haven't changed anything significant that could have altered my computer. I'm using:

late 2013 MacPro model

- with a SSD

- 32GB of DDR3 RAM

- 3.7 GHz Quad-Core Intel Xeon E5

- AMD FirePro D300 2048MB GPU

But I don't think it's the hardware

Old projects that I've worked on before are now doing the same thing. It's only during my RAM preview. Simple audio preview sounds perfectly fine. There is nothing wrong with the audio file because others that have worked before aren't working now.

I can't tell you what the problem was but I found the reset for all my preferences, tried it, and it worked. It solved my problem but I wish I could have found the source because I created my settings 2 months ago. I allocated more memory, changed a few settings but not within the past couple of days that would have created the problem. So i was just perplexed. I'd still like to know what the hell happened to cause this so I don't run into it again.